void main(){
  num a=12.5;
  a=10;
  int b=25;
  double c=10.5;

  print(b+a);
  print(b-a);
  print(b*a);
  print(b/a);
  print(b~/a);
  print(b%a);

  print(10/0);
  print(0/0);
  print(b.isEven);
  print(b.isOdd);
  print(b.isFinite);
  print(b.isInfinite);
  print(b.isNaN);
  print(b.isNegative);

  int d=-2;
  print(d.abs());
  double e=12.6;
  print(e.round());
  print(e.floor());
  print(e.ceil());
  print(e.toInt());
  print(d.toDouble());
}
